Merge pull request #2205 from abpframework/maliming/hideLanguage

Hide language switch menu if the app has only one language.

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic/Themes/Basic/Components/Toolbar/LanguageSwitch/Default.cshtml

@@ -1,5 +1,8 @@
-@using Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic.Themes.Basic.Components.Toolbar.LanguageSwitch
+@using System.Linq
+@using Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic.Themes.Basic.Components.Toolbar.LanguageSwitch
 @model LanguageSwitchViewComponentModel
+@if (Model.OtherLanguages.Any())
+{
     <div class="dropdown">
         <a class="nav-link dropdown-toggle" href="#" role="button" id="dropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
             @Model.CurrentLanguage.DisplayName
@@ -12,3 +15,4 @@
             }
         </div>
     </div> 
+}